可以。 如：Can you tell me which house is yours? 你能告诉我那个房子是你的吗？做的是主语又如：I don't know which company he works in.我不知道他在哪家公司工作。
比较少的情况，它引导名词性从句（包括宾语从句）时，表示有选择范围：I read it in a book, or on the Internet. Does it matter which it is?
可以，主语，宾语。I don't know which matters.I don't know which you like.
比较少见但是双宾语的时候可以He told me which apple is Ann‘s.
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